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/*
* Copyright 2012-2015 Freescale Semiconductor, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ASM_ARCH_MXC_BUSFREQ_H__
#define __ASM_ARCH_MXC_BUSFREQ_H__
#include <linux/notifier.h>
/*
* This enumerates busfreq low power mode entry and exit.
*/
enum busfreq_event {
LOW_BUSFREQ_ENTER,
LOW_BUSFREQ_EXIT,
};
/*
* This enumerates the system bus and ddr frequencies in various modes.
* BUS_FREQ_HIGH - DDR @ 528MHz, AHB @ 132MHz.
* BUS_FREQ_MED - DDR @ 400MHz, AHB @ 132MHz
* BUS_FREQ_AUDIO - DDR @ 50MHz/100MHz, AHB @ 24MHz.
* BUS_FREQ_LOW - DDR @ 24MHz, AHB @ 24MHz.
* BUS_FREQ_ULTRA_LOW - DDR @ 1MHz, AHB - 3MHz.
*
* Drivers need to request/release the bus/ddr frequencies based on their performance
* requirements. Drivers cannot request/release BUS_FREQ_ULTRA_LOW mode as
* this mode is automatically entered from either BUS_FREQ_AUDIO or BUS_FREQ_LOW
* modes.
*/
enum bus_freq_mode {
BUS_FREQ_HIGH,
BUS_FREQ_MED,
BUS_FREQ_AUDIO,
BUS_FREQ_LOW,
BUS_FREQ_ULTRA_LOW,
};
#ifdef CONFIG_CPU_FREQ
void request_bus_freq(enum bus_freq_mode mode);
void release_bus_freq(enum bus_freq_mode mode);
int register_busfreq_notifier(struct notifier_block *nb);
int unregister_busfreq_notifier(struct notifier_block *nb);
int get_bus_freq_mode(void);
#else
static inline void request_bus_freq(enum bus_freq_mode mode)
{
return;
}
static inline void release_bus_freq(enum bus_freq_mode mode)
{
return;
}
static inline int register_busfreq_notifier(struct notifier_block *nb)
{
return 0;
}
static inline int unregister_busfreq_notifier(struct notifier_block *nb)
{
return 0;
}
static inline int get_bus_freq_mode(void)
{
return BUS_FREQ_HIGH;
}
#endif
#endif
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